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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e84c08919c7a70f38eb2075a19642d911b8d1f7d4dee41698cb35750f7642ae' 
  AND token = '4ADm8tPM8xFzxuQSWS/8ehV8//I4GV0NFtEgu7trPl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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