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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '657a02e2b29de971091018ac0775a72d5e60c17ee3c07773731e065a28891cc8' 
  AND token = '4DHh6J5eTwW6pzz2BmS0xzLiJSuwcxkpdxM6h034yr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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