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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2008149ec2e342182069c3a16cd872601905560cf276c62d60d101df45b1d485' 
  AND token = 'cVZHR+7GdVCVBiG3wKCZy9Ibi76qovTyuoof8aMR8K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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