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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad2fd2c74f3085198300af803658814a67f412c74acecb310bc6faf6b2b8b207' 
  AND token = 'WkEfdlcGWaaEwlrQoZ7U9KZ6lplX/ztB9K/96eKrxHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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