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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bdb262c26900cb68c4430a39ea1d13315032e2ef044dd4a8265ea43bb703517' 
  AND token = 'PoM11C7YsZBEleCs9LoTKtKuhsv9XMS5MNVNI3uHxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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