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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da07d91013f3a82befba03f1626c1ff1820683a4b115be75fc0af956702a6e4' 
  AND token = '4wKZPhnSOEWkL0PhBlm3Eqc373Pa/oGIzeZuIf8gx1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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