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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b5f03bcb8ca773ed1feff6e58708a3e004d5cde1c4d8551e02bb70b423c3603' 
  AND token = 'MNulnNhvhWtNCCkLWt3YJYqmv0wMXy/rPRoNN7tqmjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}