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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3233a8c2e871406196d2ff11e7afc41a8e95a9d0d9aab28e32208c80c6982d58' 
  AND token = 'bq5aAArbQEeMA9eozAr7zpTTLQ1YkxABXCkp2ynI3ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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