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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb84e0c36776eb2992ccea17ce87b25aed2c81c737ec39c190b756068c54d2d7' 
  AND token = 'kdH3GvMjpjfj2HMKlYzS2Hdl4QChbnVTj2m7J5ZXTmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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