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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbb164dad14b6f4955ce510d151840a1b70581b2cb258febc6626f8e0586d804' 
  AND token = 'dbXizMZVhbDSsVSKe0ceFYZcQTtRbv2+XAtTcAUSf9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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