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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c918c6eca1fc0bae980a0df29caca4dd463b44626e3a962d610bf7d5ef275efe' 
  AND token = '7Mr2CxRF4Km1qz4bfwP9V9Mp9OwfAA5PKqUVkaUSScY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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