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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0035fa1cc26a650145c31bfda64506f8d74f50ab834c0607f3ac0d5072152cd0' 
  AND token = 'DBKYrpEck4Vtsq6oiehMXNZrxMk0XDuzTMte1b1zShk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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