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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46617354f0e74a2820bc8db8d525f6ceba6ca14401c72083bc51b69f390e4dd' 
  AND token = 'LfjfW9nfx/MyP0MSydl40aOUcEP8yA/7lO+GGV3wOEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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