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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc494d04557ab918c9031bde22a80fefcdb3e6c131585c7def60a28596b9792d' 
  AND token = 'Xb0KzLmCvtYsz5IHmDstc87n/GjpHblNSPEpVHkeiiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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