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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a105b3c7930759bdf65703d320a89a079448b5a2be888a7242a834790aeb504' 
  AND token = 'dUd9tuGqe5VdfO/ISOOJpouohC1a8U4dxNFoYlBLQIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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