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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c45c8907adbce60f8ee82ab6174ca3a9bb2c40c4af5df699ed1e52aacd95666' 
  AND token = '9jgm89PjGJY34kjlxPI1vT5q88yXcq8AYPGW01MSfW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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