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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd416b612b9dcd51eda8c64de9406a6fe00a095423a80825610a85d8a13855468' 
  AND token = 'DcGZdeyMN+lIki9zSfd/a7xJK54fxBz7MIiHWcqlb6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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