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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fada12ef2349aebe9d9ab6928deaee42712e5c29ccd9088a7b3c7a08247ac6ab' 
  AND token = 'IInO2/Ax2DrUBdW+qHIaJ6wN50Aud1vNw6jW334F/cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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