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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b8b54d160ce092cdd64e9cded6fae99777575973cf2a0fc052e4859f944c8a0' 
  AND token = 'ICHtg7k6ZdhNpPz0blpQhKwN81Ykwewb8247GUgP+pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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