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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f0d707f00ad9445d07ed47c3598bdbd798c7fac6f5798eaee3c33ade2e51685' 
  AND token = 'for8xxokm23NVcH0v6fibGYLQyCrN3Iolg88OY+zjiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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