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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33a30d7ba2fbd9957c5007b381eb47dc37a535e3ecdcf8ce49981a7f82d2b27b' 
  AND token = 'a4vWl4mPXT4gMNHJoFzyGrkG+jO2XRq5ga0wbnDoy1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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