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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4b7d1eb31c80ebca779d71ef8829767d24f6d647c990951cf7726a0cb74296b' 
  AND token = 'waWahfWk6vdplGcFs5+i7qRjHY5bab7/axbYkVRvGfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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