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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3066491def9a7b2a96bfe8fa85b8bcfac97ed523b9432d3d7746b2eefd6600dd' 
  AND token = 'TdtPLzJbq6tXjN/NIOWv07ZSaWkHXXmjP7dm59Hcb28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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