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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2371ecbfce1e636b3524071fa6962ed5ca2807b51eeb6900f7d286934afcdb4' 
  AND token = 'k/p3Wcf5NIa37hYypFW70sXBn55VOTYHnMDezVT0b0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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