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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '512adbde60b0f2c6410dc1a0384f7345b79e13b2621b3cf96583e2315e2582c2' 
  AND token = '8PCGE0Xb4zF6YfqR2pH1jweQaVkesQeOY/Z063zYcT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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