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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f182de97a9f9aab81e45b66f83e724ef1181b49798ab65f51b87e6659ddb7694' 
  AND token = 'NTWQ8m4ny5xUShR38ydw6pOa9z4YJRuuWg+ZGbv7tvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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