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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f2456073275251a243c3f74ef7c18c32aab12b1ba5ba2ac2e4761139b92e42' 
  AND token = 'lL3sBVGc3NWFI/yr8eHxpHU8JcrHZo6BOZ+Ei+VR11E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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