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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1f759674df0f8cc3db4976fc873fd00ef1eb3b08db7a95cf31783275ae8ad79' 
  AND token = '0yugCkLcvi0ZN557S4EeCasnfspaRncygNG0P/1rgYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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