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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c1abc57bfd1c7ba32cdbae4887617116a46bd3cc1ddf93cf4ff6d440c40a09f' 
  AND token = 'baHFGK718Q2JwvLxyIb2KE9akNDjy/lss1ht4Wc16BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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