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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d70c8c867a16b0698ea6a9f0885fa02b7f778a0a3fd4336486f8643add615f' 
  AND token = '4oZO45ubEdnJVM2TinguEHm+14ce2aLomt7XGCBBuOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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