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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be96dd47c4af642bd0f50ff4ce727a1d1f58acee9cd87edb4d88bfd7b3863649' 
  AND token = 'c3sHEbEXhYASoayjzr76erScnE7oqlT3s1EV6d5y9Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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