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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da4c3cd83202b6e82d1ab46ccaa0eee7f98bd3cc8442739de87b9b4aa899d154' 
  AND token = 'OF1+67t2DE2JQMs56h1i5J30u/6cQqFRkA/OkB13S2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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