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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73d3b3d3b00105a684986b51d362fe9f15e8b8fb69fc2193a9ba563038d68d24' 
  AND token = 'wNH/5LtO6vmcrQnd1Z4Izq/x8IuBBrW2o8/BUS1CpaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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