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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6cb4ebdbd55df21c3ecca50201b4892ae9279b2ed76ec3a988005b6989c6aa7' 
  AND token = '20trIwh5j5E5dioTqjmoEf2AiKs1GAUfqVKK9u7+aT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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