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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38ea0d86a7e446804cdcbff2cd5566eebd4d64efdc7b5bb9cf72352b4e7a2dea' 
  AND token = 'pDTDzJ6DqKW6YfmvbJdUrjfyqZ22u6SibJcDinC/J/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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