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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b4d1baf226ffb9873ce8db484cee845fb49fbe244a4deafb42114cd5529abc2' 
  AND token = 'xnF5Cl3HF/kuFU8LxsfbNYL+tmhV3FmIp00w+arY6yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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