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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbea5a7ab05a5f0373d04f1c4dd081b026dbaf747c26d027ca0ac34ca6a03703' 
  AND token = '+ZPHYzGLVRyG5BRkesqD4zVbjhqs6hn65qsCFzQq8uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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