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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7f9a0ddc9ba9b9cfe0222f993f53e6bc881277469c8f79fbaac35f62566dd2' 
  AND token = 'JYZQPTlpAPZKDaHHSM0JCNVC/xe1nSTfwnAJ8IW2AeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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