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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66007ecb5600ce0e88ac20ef7f91ab6a9a43588bc6bd95661e6342303caa11de' 
  AND token = '36bJfYXTV1PTqOz1vBHTLTPWIRbLw/T4cGWfYO6PgGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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