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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2a25f886926a688ebc73ee626b3c2262fda14dc11d32b9049d8302f892e0a49' 
  AND token = 'Tn3T61YEEiur5SMm3/k7WXGjyhMkeL8bFE6szJMPeXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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