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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58662b1bbdab2b1b7521437865dd633dcbeda762cfb6503bdacfea0e21e13931' 
  AND token = '3JGC0XHDi98AMl74Ul3sDJ0xRDsxLs60yWWeaWinoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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