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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d2542caa6c01ac272c49ef8d0109436dcbc4839cd043c056c29118f955e2941' 
  AND token = 's4l1AHrulaqXn1XNij/xWqRZi3XcndGKR1Jdiws83UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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