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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b2ea4094404676e5b99681c28163ef70be0be8431aa0aaa24adae2f9d5bfad5' 
  AND token = '9y41h2tqRvHoRGdytNTfjYreWX+Dckoi4rHGOEmqq/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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