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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d399a5bb15a4cb11eb7fd7dca5000025d6661c3413a1199cc103371097255cf' 
  AND token = 'bisSQVSF/Ukh91LQ78prTvN/wh4h0fT2vJ7ioobMH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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