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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1570cb61ed4273dbefdb104f42ca115d59fcc30ccad33a1648a2597d0293afc5' 
  AND token = 'JH+FEoMJXjLyNTOy2M60vc9DTmCvgP/C4LESx2P24jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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