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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4be84b028365e841b5ae459eaa3f980f7cffd16de73ff868f7833486a3b3baa' 
  AND token = '9DFPT8jnsUGy7r4ahwerVx75M7w0q7sHFC00j1+QCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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