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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb06017e0244cb6a727a29e54ada9cd8a26d3137f1c29a41ac707b2be7801043' 
  AND token = 'P8FGY/BfLv/3Z2sE3t2yHbBZrIBpTIAX1fi/XGtdUn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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