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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4b8de1602cd5eaefacb81f3e2f010c1b616d1250fde725db30661af7d2ec7ae' 
  AND token = '7XJBGQdxe4aI0fHGCUb716PG9ljtNt8c1VUIixJ5Rxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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