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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c961f9e3220fdf7b735de22e928e442924b1907a963dca1eb8fc892fe824447' 
  AND token = 'Z4mnOLsWQVFEzFx8EmIJwFWRlB6g9aQtpNP0d1MnkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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