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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '872b9d816a44653b56f58187e3bcb1af39e9e41dcf080d54b67f745177fa0e03' 
  AND token = '3k/ltKmjAsqWsP/ZAZpNvSC8xE6Z06pTn31i3pUEDvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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