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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b35ab6ea3675864ef38819d47dff37198785fdc2f1c3f5d712f64ac35a0d24a' 
  AND token = 'gsup63P0jzOaPUcyXD+Wip8sacUADKXI1tBbln1Vetc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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