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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '157ffae7aa252e5f48df414286037cf48385726943205c6eb589d61bdad0c0e8' 
  AND token = 'a+1HcuNVfnB6yp9pBd51cskPowwSGNcRdN8D8YN8oqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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