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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ab17ae42a423bc206d4f29b4f1e68b362db44819ccffc70d5848f726e9225eb' 
  AND token = '8wpHu2mldyRyW/TxvInuYGeYmYe008Wq45zcbhVBdk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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