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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c05e37ea013541463a60e465ef28dfad8974bfc91d1903f6b37653055c968f0' 
  AND token = '9UeRxEt74lEyNZRYoFqBwBHGSNVX8TFHPqnDEkeAUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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