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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c6d6ca012c92334e88ff6a5844352921dc2efb2120614f48d2ea1af792288a3' 
  AND token = 'EnBb/jiWTwSW4teXfZLNaxSf/tsqB3Rd/A9koYY3qtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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