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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad7543690cde02d63e657366a549fd65299d52fd9ffc094d4b648df024f4dc6e' 
  AND token = 'U68kWU5njdGKyQuZCDKyaaOzGHNtjepX8DCU3UOl758=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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