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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d8a26989c8d8a0efdb0970ee773aef12a5c7f68d6e69b727428a64a742c48e' 
  AND token = 'BFPfO16cfBgz15Rjf7w3EMJPZdy736b3gAC/RRq8tAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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