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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17fc8d0c60e898200462e3a9e73f78c9fa18a37909a8c965d337bd3fa089fe52' 
  AND token = 'f9dwDnah2ALtf1rP79phM2ydR6Tu6HISvzSUdyh/ru8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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